var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.engine('html',require('ejs').__express);
app.set('view engine', 'html');


/* 允许跨域，允许其他端口访问站点接口 */
var allowCors = function(req, res, next) { 
	res.header('Access-Control-Allow-Origin', req.headers.origin);
	res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,OPTIONS');
	res.header('Access-Control-Allow-Headers', 'Content-Type');
	res.header('Access-Control-Allow-Credentials','true'); next(); 
}; 
app.use(allowCors); //使用跨域中间件

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

//设置路由
app.use('/', require('./routes/index'));

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});



module.exports = app;
